...

compiler/NubLang/Generation/QBE/QBEGenerator.cs

@@ -372,12 +372,12 @@ public class QBEGenerator
 
         foreach (var field in structDef.Fields)
         {
-            if (field.Value.TryGetValue(out var value))
+            if (field.Value != null)
             {
                 var offset = OffsetOf(TypeOfStruct(structDef), field.Name);
                 var destination = TmpName();
                 _writer.Indented($"{destination} =l add %struct, {offset}");
-                EmitCopyInto(value, destination);
+                EmitCopyInto(field.Value, destination);
             }
         }
 
@@ -566,9 +566,9 @@ public class QBEGenerator
 
     private void EmitReturn(ReturnNode @return)
     {
-        if (@return.Value.HasValue)
+        if (@return.Value != null)
         {
-            var result = EmitExpression(@return.Value.Value);
+            var result = EmitExpression(@return.Value);
             EmitScopeCleanup();
             _writer.Indented($"ret {result}");
         }
@@ -584,9 +584,9 @@ public class QBEGenerator
         var name = $"%{variableDeclaration.Name}";
         _writer.Indented($"{name} =l alloc8 {SizeOf(variableDeclaration.Type)}");
 
-        if (variableDeclaration.Assignment.HasValue)
+        if (variableDeclaration.Assignment != null)
         {
-            EmitCopyInto(variableDeclaration.Assignment.Value, name);
+            EmitCopyInto(variableDeclaration.Assignment, name);
         }
 
         Scope.Variables.Push(new Variable(variableDeclaration.Name, variableDeclaration.Type));
@@ -1234,7 +1234,7 @@ public class QBEGenerator
     private NubStructType TypeOfStruct(StructNode definition)
     {
         var fieldTypes = definition.Fields
-            .Select(x => new NubStructFieldType(x.Name, x.Type, x.Value.HasValue))
+            .Select(x => new NubStructFieldType(x.Name, x.Type, x.Value != null))
             .ToList();
 
         var functionTypes = new List<NubStructFuncType>();

compiler/NubLang/Modules/Module.cs

@@ -4,42 +4,34 @@ namespace NubLang.Modules;
 
 public class Module
 {
-    private readonly List<ModuleStruct> _structs = [];
+    private readonly List<DefinitionSyntax> _definitions = [];
-    private readonly List<StructTemplateSyntax> _structTemplates = [];
-    private readonly List<ModuleFunction> _functions = [];
 
-    public void RegisterStruct(bool exported, string name, List<ModuleStructField> fields, List<ModuleStructFunction> functions)
+    public void Register(DefinitionSyntax definition)
     {
-        _structs.Add(new ModuleStruct(exported, name, fields, functions));
+        _definitions.Add(definition);
     }
 
-    public void RegisterStructTemplate(StructTemplateSyntax structTemplate)
+    public List<StructSyntax> Structs(bool includePrivate)
     {
-        _structTemplates.Add(structTemplate);
+        return _definitions
+            .OfType<StructSyntax>()
+            .Where(x => x.Exported || includePrivate)
+            .ToList();
     }
 
-    public void RegisterFunction(bool exported, string name, string? externSymbol, List<ModuleFunctionParameter> parameters, TypeSyntax returnType)
+    public List<StructTemplateSyntax> StructTemplates(bool includePrivate)
     {
-        _functions.Add(new ModuleFunction(exported, name, externSymbol, parameters, returnType));
+        return _definitions
+            .OfType<StructTemplateSyntax>()
+            .Where(x => x.Exported || includePrivate)
+            .ToList();
     }
 
-    public List<ModuleStruct> StructTypes(bool includePrivate)
+    public List<FuncSyntax> Functions(bool includePrivate)
     {
-        return _structs.Where(x => x.Exported || includePrivate).ToList();
+        return _definitions
-    }
+            .OfType<FuncSyntax>()
-
+            .Where(x => x.Exported || includePrivate)
-    public List<ModuleFunction> Functions(bool includePrivate)
+            .ToList();
-    {
-        return _functions.Where(x => x.Exported || includePrivate).ToList();
     }
 }
-
-public record ModuleStructField(string Name, TypeSyntax Type, bool HasDefaultValue);
-
-public record ModuleStructFunction(string Name, string? Hook, List<ModuleFunctionParameter> Parameters, TypeSyntax ReturnType);
-
-public record ModuleStruct(bool Exported, string Name, List<ModuleStructField> Fields, List<ModuleStructFunction> Functions);
-
-public record ModuleFunctionParameter(string Name, TypeSyntax Type);
-
-public record ModuleFunction(bool Exported, string Name, string? ExternSymbol, List<ModuleFunctionParameter> Parameters, TypeSyntax ReturnType);

compiler/NubLang/Modules/ModuleRepository.cs

@@ -10,8 +10,7 @@ public class ModuleRepository
     {
         foreach (var syntaxTree in syntaxTrees)
         {
-            var moduleName = syntaxTree.Metadata.ModuleName;
+            var module = GetOrCreate(syntaxTree.Metadata.ModuleName);
-            var module = GetOrCreate(moduleName);
             ProcessSyntaxTree(module, syntaxTree);
         }
     }
@@ -20,47 +19,7 @@ public class ModuleRepository
     {
         foreach (var definition in syntaxTree.Definitions)
         {
-            switch (definition)
+            module.Register(definition);
-            {
-                case FuncSyntax funcDef:
-                {
-                    var parameters = funcDef.Signature.Parameters
-                        .Select(x => new ModuleFunctionParameter(x.Name, x.Type))
-                        .ToList();
-
-                    module.RegisterFunction(funcDef.Exported, funcDef.Name, funcDef.ExternSymbol, parameters, funcDef.Signature.ReturnType);
-                    break;
-                }
-                case StructSyntax structDef:
-                {
-                    var fields = structDef.Fields
-                        .Select(x => new ModuleStructField(x.Name, x.Type, x.Value.HasValue))
-                        .ToList();
-
-                    var functions = structDef.Functions
-                        .Select(x =>
-                        {
-                            var parameters = x.Signature.Parameters
-                                .Select(y => new ModuleFunctionParameter(y.Name, y.Type))
-                                .ToList();
-
-                            return new ModuleStructFunction(x.Name, x.Hook, parameters, x.Signature.ReturnType);
-                        })
-                        .ToList();
-
-                    module.RegisterStruct(structDef.Exported, structDef.Name, fields, functions);
-                    break;
-                }
-                case StructTemplateSyntax structDef:
-                {
-                    module.RegisterStructTemplate(structDef);
-                    break;
-                }
-                default:
-                {
-                    throw new ArgumentOutOfRangeException(nameof(definition));
-                }
-            }
         }
     }
 

compiler/NubLang/Optional.cs

@@ -1,82 +0,0 @@
-using System.Diagnostics.CodeAnalysis;
-
-namespace NubLang;
-
-public static class Optional
-{
-    public static Optional<TValue> Empty<TValue>() => new();
-
-    /// <summary>
-    /// Alias for creating an Optional which allows for implicit types
-    /// </summary>
-    public static Optional<TValue> OfNullable<TValue>(TValue? value)
-    {
-        return value ?? Optional<TValue>.Empty();
-    }
-
-    /// <summary>
-    /// Converts a nullable type to an Optional
-    /// </summary>
-    public static Optional<TValue> ToOptional<TValue>(this TValue? value)
-    {
-        return OfNullable(value);
-    }
-}
-
-public readonly struct Optional<TValue>
-{
-    public static Optional<TValue> Empty() => new();
-
-    public static Optional<TValue> OfNullable(TValue? value)
-    {
-        return value ?? Empty();
-    }
-
-    public Optional()
-    {
-        Value = default;
-        HasValue = false;
-    }
-
-    public Optional(TValue value)
-    {
-        Value = value;
-        HasValue = true;
-    }
-
-    public TValue? Value { get; }
-
-    [MemberNotNullWhen(true, nameof(Value))]
-    public bool HasValue { get; }
-
-
-    [MemberNotNullWhen(true, nameof(Value))]
-    public bool TryGetValue([NotNullWhen(true)] out TValue? value)
-    {
-        if (HasValue)
-        {
-            value = Value;
-            return true;
-        }
-
-        value = default;
-        return false;
-    }
-
-    public TValue GetValue()
-    {
-        return Value ?? throw new InvalidOperationException("Value is not set");
-    }
-
-    public static implicit operator Optional<TValue>(TValue value) => new(value);
-
-    public TValue Or(TValue other)
-    {
-        if (HasValue)
-        {
-            return Value;
-        }
-
-        return other;
-    }
-}

compiler/NubLang/Parsing/Parser.cs

@@ -206,7 +206,7 @@ public sealed class Parser
                 ExpectSymbol(Symbol.Colon);
                 var fieldType = ParseType();
 
-                var fieldValue = Optional<ExpressionSyntax>.Empty();
+                ExpressionSyntax? fieldValue = null;
 
                 if (TryExpectSymbol(Symbol.Assign))
                 {
@@ -267,13 +267,13 @@ public sealed class Parser
     {
         var name = ExpectIdentifier().Value;
 
-        var explicitType = Optional<TypeSyntax>.Empty();
+        TypeSyntax? explicitType = null;
         if (TryExpectSymbol(Symbol.Colon))
         {
             explicitType = ParseType();
         }
 
-        var assignment = Optional<ExpressionSyntax>.Empty();
+        ExpressionSyntax? assignment = null;
         if (TryExpectSymbol(Symbol.Assign))
         {
             assignment = ParseExpression();
@@ -290,7 +290,7 @@ public sealed class Parser
 
     private ReturnSyntax ParseReturn(int startIndex)
     {
-        var value = Optional<ExpressionSyntax>.Empty();
+        ExpressionSyntax? value = null;
 
         if (!TryExpectSymbol(Symbol.Semi))
         {
@@ -305,7 +305,7 @@ public sealed class Parser
         var condition = ParseExpression();
         var body = ParseBlock();
 
-        var elseStatement = Optional<Variant<IfSyntax, BlockSyntax>>.Empty();
+        Variant<IfSyntax, BlockSyntax>? elseStatement = null;
 
         var elseStartIndex = _tokenIndex;
         if (TryExpectSymbol(Symbol.Else))
@@ -456,7 +456,7 @@ public sealed class Parser
                 Symbol.Minus => new UnaryExpressionSyntax(GetTokens(startIndex), UnaryOperatorSyntax.Negate, ParsePrimaryExpression()),
                 Symbol.Bang => new UnaryExpressionSyntax(GetTokens(startIndex), UnaryOperatorSyntax.Invert, ParsePrimaryExpression()),
                 Symbol.OpenBracket => ParseArrayInitializer(startIndex),
-                Symbol.OpenBrace => new StructInitializerSyntax(GetTokens(startIndex), Optional<TypeSyntax>.Empty(), ParseStructInitializerBody()),
+                Symbol.OpenBrace => new StructInitializerSyntax(GetTokens(startIndex), null, ParseStructInitializerBody()),
                 Symbol.Struct => ParseStructInitializer(startIndex),
                 Symbol.At => ParseCompilerMacro(startIndex),
                 _ => throw new ParseException(Diagnostic
@@ -605,7 +605,7 @@ public sealed class Parser
 
     private StructInitializerSyntax ParseStructInitializer(int startIndex)
     {
-        var type = Optional.Empty<TypeSyntax>();
+        TypeSyntax? type = null;
         if (!TryExpectSymbol(Symbol.OpenBrace))
         {
             type = ParseType();
@@ -921,19 +921,6 @@ public sealed class Parser
         return literal;
     }
 
-    private bool TryExpectLiteral(LiteralKind kind, [NotNullWhen(true)] out LiteralToken? literal)
-    {
-        if (CurrentToken is LiteralToken identifierToken)
-        {
-            literal = identifierToken;
-            Next();
-            return true;
-        }
-
-        literal = null;
-        return false;
-    }
-
     private void Next()
     {
         _tokenIndex++;

compiler/NubLang/Parsing/Syntax/DefinitionSyntax.cs

@@ -10,7 +10,7 @@ public record FuncSignatureSyntax(List<Token> Tokens, List<FuncParameterSyntax>
 
 public record FuncSyntax(List<Token> Tokens, string Name, bool Exported, string? ExternSymbol, FuncSignatureSyntax Signature, BlockSyntax? Body) : DefinitionSyntax(Tokens, Name, Exported);
 
-public record StructFieldSyntax(List<Token> Tokens, string Name, TypeSyntax Type, Optional<ExpressionSyntax> Value) : SyntaxNode(Tokens);
+public record StructFieldSyntax(List<Token> Tokens, string Name, TypeSyntax Type, ExpressionSyntax? Value) : SyntaxNode(Tokens);
 
 public record StructFuncSyntax(List<Token> Tokens, string Name, string? Hook, FuncSignatureSyntax Signature, BlockSyntax Body) : SyntaxNode(Tokens);
 

compiler/NubLang/Parsing/Syntax/ExpressionSyntax.cs

@@ -54,7 +54,7 @@ public record LiteralSyntax(List<Token> Tokens, string Value, LiteralKind Kind)
 
 public record StructFieldAccessSyntax(List<Token> Tokens, ExpressionSyntax Target, string Member) : ExpressionSyntax(Tokens);
 
-public record StructInitializerSyntax(List<Token> Tokens, Optional<TypeSyntax> StructType, Dictionary<string, ExpressionSyntax> Initializers) : ExpressionSyntax(Tokens);
+public record StructInitializerSyntax(List<Token> Tokens, TypeSyntax? StructType, Dictionary<string, ExpressionSyntax> Initializers) : ExpressionSyntax(Tokens);
 
 public record DereferenceSyntax(List<Token> Tokens, ExpressionSyntax Target) : ExpressionSyntax(Tokens);
 

compiler/NubLang/Parsing/Syntax/StatementSyntax.cs

@@ -8,13 +8,13 @@ public record BlockSyntax(List<Token> Tokens, List<StatementSyntax> Statements)
 
 public record StatementExpressionSyntax(List<Token> Tokens, ExpressionSyntax Expression) : StatementSyntax(Tokens);
 
-public record ReturnSyntax(List<Token> Tokens, Optional<ExpressionSyntax> Value) : StatementSyntax(Tokens);
+public record ReturnSyntax(List<Token> Tokens, ExpressionSyntax? Value) : StatementSyntax(Tokens);
 
 public record AssignmentSyntax(List<Token> Tokens, ExpressionSyntax Target, ExpressionSyntax Value) : StatementSyntax(Tokens);
 
-public record IfSyntax(List<Token> Tokens, ExpressionSyntax Condition, BlockSyntax Body, Optional<Variant<IfSyntax, BlockSyntax>> Else) : StatementSyntax(Tokens);
+public record IfSyntax(List<Token> Tokens, ExpressionSyntax Condition, BlockSyntax Body, Variant<IfSyntax, BlockSyntax>? Else) : StatementSyntax(Tokens);
 
-public record VariableDeclarationSyntax(List<Token> Tokens, string Name, Optional<TypeSyntax> ExplicitType, Optional<ExpressionSyntax> Assignment) : StatementSyntax(Tokens);
+public record VariableDeclarationSyntax(List<Token> Tokens, string Name, TypeSyntax? ExplicitType, ExpressionSyntax? Assignment) : StatementSyntax(Tokens);
 
 public record ContinueSyntax(List<Token> Tokens) : StatementSyntax(Tokens);
 

compiler/NubLang/Tokenization/Tokenizer.cs

@@ -82,17 +82,18 @@ public sealed class Tokenizer
     {
         _index = 0;
 
-        while (Peek().TryGetValue(out var current))
+        while (Peek() != null)
         {
+            var current = Peek()!.Value;
             if (char.IsWhiteSpace(current))
             {
                 Next();
                 continue;
             }
 
-            if (current == '/' && Peek(1).TryGetValue(out var nextChar) && nextChar == '/')
+            if (current == '/' && Peek(1) == '/')
             {
-                while (Peek().TryGetValue(out var ch) && ch != '\n')
+                while (Peek().HasValue && Peek() != '\n')
                 {
                     Next();
                 }
@@ -106,9 +107,9 @@ public sealed class Tokenizer
             {
                 var buffer = string.Empty;
 
-                while (Peek().TryGetValue(out var next) && (char.IsLetterOrDigit(next) || next == '_'))
+                while (Peek() != null && (char.IsLetterOrDigit(Peek()!.Value) || Peek() == '_'))
                 {
-                    buffer += next;
+                    buffer += Peek();
                     Next();
                 }
 
@@ -133,8 +134,9 @@ public sealed class Tokenizer
                 var isFloat = false;
                 var buffer = string.Empty;
 
-                while (Peek().TryGetValue(out var next))
+                while (Peek() != null)
                 {
+                    var next = Peek()!.Value;
                     if (next == '.')
                     {
                         if (isFloat)
@@ -168,11 +170,12 @@ public sealed class Tokenizer
 
                 while (true)
                 {
-                    if (!Peek().TryGetValue(out var next))
+                    if (Peek() == null)
                     {
                         throw new Exception("Unclosed string literal");
                     }
                     
+                    var next = Peek()!.Value;
                     if (next == '"')
                     {
                         Next();
@@ -224,14 +227,14 @@ public sealed class Tokenizer
         }
     }
 
-    private Optional<char> Peek(int offset = 0)
+    private char? Peek(int offset = 0)
     {
         if (_index + offset < _sourceFile.GetText().Length)
         {
             return _sourceFile.GetText()[_index + offset];
         }
 
-        return Optional<char>.Empty();
+        return null;
     }
 
     private void Next()

compiler/NubLang/TypeChecking/Node/DefinitionNode.cs

@@ -8,7 +8,7 @@ public record FuncSignatureNode(List<FuncParameterNode> Parameters, NubType Retu
 
 public record FuncNode(string Module, string Name, string? ExternSymbol, FuncSignatureNode Signature, BlockNode? Body) : DefinitionNode(Module, Name);
 
-public record StructFieldNode(string Name, NubType Type, Optional<ExpressionNode> Value) : Node;
+public record StructFieldNode(string Name, NubType Type, ExpressionNode? Value) : Node;
 
 public record StructFuncNode(string Name, string? Hook, FuncSignatureNode Signature, BlockNode Body) : Node;
 

compiler/NubLang/TypeChecking/Node/StatementNode.cs

@@ -10,13 +10,13 @@ public record StatementFuncCallNode(FuncCallNode FuncCall) : StatementNode;
 
 public record StatementStructFuncCallNode(StructFuncCallNode StructFuncCall) : StatementNode;
 
-public record ReturnNode(Optional<ExpressionNode> Value) : TerminalStatementNode;
+public record ReturnNode(ExpressionNode? Value) : TerminalStatementNode;
 
 public record AssignmentNode(LValueExpressionNode Target, ExpressionNode Value) : StatementNode;
 
-public record IfNode(ExpressionNode Condition, BlockNode Body, Optional<Variant<IfNode, BlockNode>> Else) : StatementNode;
+public record IfNode(ExpressionNode Condition, BlockNode Body, Variant<IfNode, BlockNode>? Else) : StatementNode;
 
-public record VariableDeclarationNode(string Name, Optional<ExpressionNode> Assignment, NubType Type) : StatementNode;
+public record VariableDeclarationNode(string Name, ExpressionNode? Assignment, NubType Type) : StatementNode;
 
 public record ContinueNode : TerminalStatementNode;
 

compiler/NubLang/TypeChecking/TypeChecker.cs

@@ -87,7 +87,7 @@ public sealed class TypeChecker
     private StructNode CheckStructDefinition(StructSyntax node)
     {
         var fieldTypes = node.Fields
-            .Select(x => new NubStructFieldType(x.Name, ResolveType(x.Type), x.Value.HasValue))
+            .Select(x => new NubStructFieldType(x.Name, ResolveType(x.Type), x.Value != null))
             .ToList();
 
         var fieldFunctions = node.Functions
@@ -132,10 +132,10 @@ public sealed class TypeChecker
 
     private StructFieldNode CheckStructField(StructFieldSyntax field)
     {
-        var value = Optional.Empty<ExpressionNode>();
+        ExpressionNode? value = null;
-        if (field.Value.HasValue)
+        if (field.Value != null)
         {
-            value = CheckExpression(field.Value.Value, ResolveType(field.Type));
+            value = CheckExpression(field.Value, ResolveType(field.Type));
         }
 
         return new StructFieldNode(field.Name, ResolveType(field.Type), value);
@@ -161,13 +161,13 @@ public sealed class TypeChecker
             {
                 if (signature.ReturnType is NubVoidType)
                 {
-                    body.Statements.Add(new ReturnNode(Optional<ExpressionNode>.Empty()));
+                    body.Statements.Add(new ReturnNode(null));
                 }
                 else
                 {
                     Diagnostics.Add(Diagnostic
                         .Error("Not all code paths return a value")
-                        .At(node.Body.Tokens.LastOrDefault())
+                        .At(node.Body)
                         .Build());
                 }
             }
@@ -194,10 +194,10 @@ public sealed class TypeChecker
     {
         var condition = CheckExpression(statement.Condition, new NubBoolType());
         var body = CheckBlock(statement.Body);
-        var elseStatement = Optional.Empty<Variant<IfNode, BlockNode>>();
+        Variant<IfNode, BlockNode>? elseStatement = null;
-        if (statement.Else.TryGetValue(out var elseSyntax))
+        if (statement.Else.HasValue)
         {
-            elseStatement = elseSyntax.Match<Variant<IfNode, BlockNode>>(elif => CheckIf(elif), el => CheckBlock(el));
+            elseStatement = statement.Else.Value.Match<Variant<IfNode, BlockNode>>(elif => CheckIf(elif), el => CheckBlock(el));
         }
 
         return new IfNode(condition, body, elseStatement);
@@ -205,11 +205,11 @@ public sealed class TypeChecker
 
     private ReturnNode CheckReturn(ReturnSyntax statement)
     {
-        var value = Optional.Empty<ExpressionNode>();
+        ExpressionNode? value = null;
 
-        if (statement.Value.TryGetValue(out var valueExpression))
+        if (statement.Value != null)
         {
-            value = CheckExpression(valueExpression, _funcReturnTypes.Peek());
+            value = CheckExpression(statement.Value, _funcReturnTypes.Peek());
         }
 
         return new ReturnNode(value);
@@ -232,14 +232,14 @@ public sealed class TypeChecker
         NubType? type = null;
         ExpressionNode? assignmentNode = null;
 
-        if (statement.ExplicitType.TryGetValue(out var explicitType))
+        if (statement.ExplicitType != null)
         {
-            type = ResolveType(explicitType);
+            type = ResolveType(statement.ExplicitType);
         }
 
-        if (statement.Assignment.TryGetValue(out var assignment))
+        if (statement.Assignment != null)
         {
-            assignmentNode = CheckExpression(assignment, type);
+            assignmentNode = CheckExpression(statement.Assignment, type);
             type ??= assignmentNode.Type;
         }
 
@@ -250,7 +250,7 @@ public sealed class TypeChecker
 
         CurrentScope.DeclareVariable(new Variable(statement.Name, type, VariableKind.LValue));
 
-        return new VariableDeclarationNode(statement.Name, Optional.OfNullable(assignmentNode), type);
+        return new VariableDeclarationNode(statement.Name, assignmentNode, type);
     }
 
     private WhileNode CheckWhile(WhileSyntax statement)
@@ -593,8 +593,8 @@ public sealed class TypeChecker
 
         if (function != null)
         {
-            var parameters = function.Parameters.Select(x => ResolveType(x.Type)).ToList();
+            var parameters = function.Signature.Parameters.Select(x => ResolveType(x.Type)).ToList();
-            var type = new NubFuncType(parameters, ResolveType(function.ReturnType));
+            var type = new NubFuncType(parameters, ResolveType(function.Signature.ReturnType));
             return new FuncIdentifierNode(type, CurrentModule, expression.Name, function.ExternSymbol);
         }
 
@@ -618,8 +618,8 @@ public sealed class TypeChecker
         var function = module.Functions(includePrivate).FirstOrDefault(x => x.Name == expression.Name);
         if (function != null)
         {
-            var parameters = function.Parameters.Select(x => ResolveType(x.Type)).ToList();
+            var parameters = function.Signature.Parameters.Select(x => ResolveType(x.Type)).ToList();
-            var type = new NubFuncType(parameters, ResolveType(function.ReturnType));
+            var type = new NubFuncType(parameters, ResolveType(function.Signature.ReturnType));
             return new FuncIdentifierNode(type, expression.Module, expression.Name, function.ExternSymbol);
         }
 
@@ -695,9 +695,9 @@ public sealed class TypeChecker
     {
         NubStructType? structType = null;
 
-        if (expression.StructType.TryGetValue(out var customType))
+        if (expression.StructType != null)
         {
-            var checkedType = ResolveType(customType);
+            var checkedType = ResolveType(expression.StructType);
             if (checkedType is not NubStructType checkedStructType)
             {
                 throw new UnreachableException("Parser fucked up");
@@ -823,7 +823,7 @@ public sealed class TypeChecker
                     return false;
                 }
 
-                return !ifNode.Else.TryGetValue(out var elseStatement) || elseStatement.Match(AlwaysReturns, AlwaysReturns);
+                return !ifNode.Else.HasValue || ifNode.Else.Value.Match(AlwaysReturns, AlwaysReturns);
             }
             default:
                 return false;
@@ -878,20 +878,30 @@ public sealed class TypeChecker
 
             var includePrivate = customType.Module == CurrentModule;
 
-            var structType = module.StructTypes(includePrivate).FirstOrDefault(x => x.Name == customType.Name);
+            var strctDef = module.Structs(includePrivate).FirstOrDefault(x => x.Name == customType.Name);
-            if (structType != null)
+            if (strctDef != null)
             {
-                var result = new NubStructType(customType.Module, structType.Name, [], []);
+                var result = new NubStructType(customType.Module, strctDef.Name, [], []);
                 _typeCache[key] = result;
 
-                var fields = structType.Fields.Select(x => new NubStructFieldType(x.Name, ResolveType(x.Type), x.HasDefaultValue)).ToList();
+                var fields = strctDef.Fields
+                    .Select(x => new NubStructFieldType(x.Name, ResolveType(x.Type), x.Value != null))
+                    .ToList();
+
                 result.Fields.AddRange(fields);
 
-                foreach (var function in structType.Functions)
+                var functions = strctDef.Functions
+                    .Select(x =>
                     {
-                    var parameters = function.Parameters.Select(x => ResolveType(x.Type)).ToList();
+                        var parameters = x.Signature.Parameters
-                    result.Functions.Add(new NubStructFuncType(function.Name, function.Hook, parameters, ResolveType(function.ReturnType)));
+                            .Select(y => ResolveType(y.Type))
-                }
+                            .ToList();
+
+                        return new NubStructFuncType(x.Name, x.Hook, parameters, ResolveType(x.Signature.ReturnType));
+                    })
+                    .ToList();
+
+                result.Functions.AddRange(functions);
 
                 ReferencedStructTypes.Add(result);
                 return result;